No insert in my LP cover either. I don't think it had one.

Frustratingly I am looking at my copy Sam Laycock 'Collected Writings' (his Bowton's Yard is on the same LP) and I know that for decades two of Harvey Kershaw's books were next to in on my late father's bookshelf. They are now in a storage unit - in Rochdale !

FWIW I think it was Harvey Kershaw's words, which would fit with the sleeve notes quoted above.